Control device for vehicle drive device

Abstract

A controller for a vehicle drive device includes an engagement control part controlling an engagement state of a first engagement device based on an engagement control instruction; a hydraulic pressure information obtaining part obtaining hydraulic pressure information indicating first hydraulic pressure supplied to the first engagement device; an acceleration information obtaining part obtaining acceleration information indicating vehicle acceleration; and a determining part determining a state of the first engagement device, and when an input rotational speed is greater than zero, a state of a transmission is a drive transmission state in which drive power is transmitted, the engagement control instruction is a disengagement instruction brining the first engagement device into a disengaged state, the first hydraulic pressure is greater than a first threshold value, and the acceleration has a negative value smaller than a second threshold value, the determining part determines the first engagement device state is an engagement abnormality.

1 . A control device for a vehicle drive device, a control target for the control device being the vehicle drive device in which in a power transmission path connecting an input member drive-coupled to an internal combustion engine to an output member drive-coupled to wheels, a first engagement device that operates by hydraulic pressure, a rotating electrical machine, and a transmission are provided in this order from an internal combustion engine side, the control device comprising:
 an engagement control part that controls a state of engagement of the first engagement device based on an engagement control instruction;   a hydraulic pressure information obtaining part that obtains hydraulic pressure information indicating first hydraulic pressure supplied to the first engagement device;   an acceleration information obtaining part that obtains acceleration information indicating acceleration of a vehicle on which the vehicle drive device is provided; and   a determining part that determines a state of the first engagement device,   wherein   when   an input rotational speed is greater than zero and a state of the transmission is a drive transmission state in which drive power is transmitted, the input rotational speed being a rotational speed of the rotating electrical machine;   the engagement control instruction is a disengagement instruction to bring the first engagement device into a disengaged state;   the first hydraulic pressure indicated by the hydraulic pressure information is greater than a first threshold value; and   acceleration indicated by the acceleration information has a negative value smaller than a second threshold value,   the determining part determines that the state of the first engagement device is an engagement abnormality where the state of the first engagement device is an engaged state in contrast to the disengagement instruction.   
     
     
         2 . The control device for a vehicle drive device according to  claim 1 , wherein when the determining part determines that the state of the first engagement device is the engagement abnormality, the determining part performs at least one of first control that brings the first engagement device into a disengaged state and second control that interrupts transmission of drive power between the rotating electrical machine and the output member. 
     
     
         3 . A control device for a vehicle drive device, a control target for the control device being the vehicle drive device in which in a power transmission path connecting an input member drive-coupled to an internal combustion engine to an output member drive-coupled to wheels, a first engagement device that operates by hydraulic pressure, a rotating electrical machine, and a transmission are provided in this order from an internal combustion engine side, the control device comprising:
 an engagement control part that controls a state of engagement of the first engagement device based on an engagement control instruction;   a hydraulic pressure information obtaining part that obtains hydraulic pressure information indicating first hydraulic pressure supplied to the first engagement device;   an acceleration information obtaining part that obtains acceleration information indicating acceleration of a vehicle on which the vehicle drive device is provided; and   a determining part that determines a state of the first engagement device,   wherein   when   an input rotational speed is greater than zero and a state of the transmission is a drive transmission state in which drive power is transmitted, the input rotational speed being a rotational speed of the rotating electrical machine;   the engagement control instruction is a disengagement instruction to bring the first engagement device into a disengaged state;   the first hydraulic pressure indicated by the hydraulic pressure information is greater than a first threshold value; and   acceleration indicated by the acceleration information has a negative value smaller than a second threshold value,   the determining part performs at least one of first control that brings the first engagement device into a disengaged state and second control that interrupts transmission of drive power between the rotating electrical machine and the output member.   
     
     
         4 . The control device for a vehicle drive device according to  claim 2 , wherein the first control includes first disengagement control that allows the engagement control part to perform control again to bring the first engagement device into a disengaged state. 
     
     
         5 . The control device for a vehicle drive device according to  claim 2 , wherein the first control includes second disengagement control that allows a first engagement control valve to operate such that the first engagement device is forcefully brought into a disengaged state, the first engagement control valve controlling the first hydraulic pressure supplied to the first engagement device. 
     
     
         6 . The control device for a vehicle drive device according to  claim 2 , wherein the first control includes third disengagement control that allows the engagement control part to restart. 
     
     
         7 . The control device for a vehicle drive device according to  claim 2 , wherein the second control includes neutral control that brings the state of the transmission into a neutral state in which drive power is not transmitted. 
     
     
         8 . The control device for a vehicle drive device according to  claim 7 , wherein
 the transmission includes one or more second engagement devices that are brought into an engaged state when a shift speed is formed, and   the neutral control includes forced neutral control that allows a second engagement control valve to operate such that the second engagement devices are forcefully brought into a disengaged state, the second engagement control valve controlling second hydraulic pressure supplied to the second engagement devices.   
     
     
         9 . The control device for a vehicle drive device according to  claim 2 , further comprising a third engagement device that connects or disconnects transmission of drive power between the rotating electrical machine and the transmission,
 wherein   the second control includes engagement disengagement control that brings the third engagement device into a disengaged state.   
     
     
         10 . The control device for a vehicle drive device according to  claim 9 , wherein the engagement disengagement control includes forced engagement disengagement control that allows a third engagement control valve to operate such that the third engagement device is forcefully brought into a disengaged state, the third engagement control valve controlling third hydraulic pressure supplied to the third engagement device. 
     
     
         11 . The control device for a vehicle drive device according to  claim 1 , wherein the determining part
 determines a state of the first engagement device by the determining part when the input rotational speed is higher than an internal combustion engine rotational speed and a difference between the input rotational speed and the internal combustion engine rotational speed is greater than a third threshold value, the internal combustion engine rotational speed being a rotational speed of the internal combustion engine, and   does not determine a state of the first engagement device by the determining part when the difference between the input rotational speed and the internal combustion engine rotational speed is less than or equal to the third threshold value.   
     
     
         12 . The control device for a vehicle drive device according to  claim 1 , further comprising a communication part that receives the engagement control instruction from an instruction device by performing communication with the instruction device, the instruction device outputting the engagement control instruction. 
     
     
         13 . The control device for a vehicle drive device according to  claim 3 , wherein the first control includes first disengagement control that allows the engagement control part to perform control again to bring the first engagement device into a disengaged state. 
     
     
         14 . The control device for a vehicle drive device according to  claim 3 , wherein the first control includes second disengagement control that allows a first engagement control valve to operate such that the first engagement device is forcefully brought into a disengaged state, the first engagement control valve controlling the first hydraulic pressure supplied to the first engagement device. 
     
     
         15 . The control device for a vehicle drive device according to  claim 3 , wherein the first control includes third disengagement control that allows the engagement control part to restart. 
     
     
         16 . The control device for a vehicle drive device according to  claim 3 , wherein the second control includes neutral control that brings the state of the transmission into a neutral state in which drive power is not transmitted. 
     
     
         17 . The control device for a vehicle drive device according to  claim 16 , wherein
 the transmission includes one or more second engagement devices that are brought into an engaged state when a shift speed is formed, and   the neutral control includes forced neutral control that allows a second engagement control valve to operate such that the second engagement devices are forcefully brought into a disengaged state, the second engagement control valve controlling second hydraulic pressure supplied to the second engagement devices.   
     
     
         18 . The control device for a vehicle drive device according to  claim 3 , further comprising a third engagement device that connects or disconnects transmission of drive power between the rotating electrical machine and the transmission,
 wherein   the second control includes engagement disengagement control that brings the third engagement device into a disengaged state.   
     
     
         19 . The control device for a vehicle drive device according to  claim 18 , wherein the engagement disengagement control includes forced engagement disengagement control that allows a third engagement control valve to operate such that the third engagement device is forcefully brought into a disengaged state, the third engagement control valve controlling third hydraulic pressure supplied to the third engagement device. 
     
     
         20 . The control device for a vehicle drive device according to  claim 3 , wherein the determining part
 determines a state of the first engagement device by the determining part when the input rotational speed is higher than an internal combustion engine rotational speed and a difference between the input rotational speed and the internal combustion engine rotational speed is greater than a third threshold value, the internal combustion engine rotational speed being a rotational speed of the internal combustion engine, and   does not determine a state of the first engagement device by the determining part when the difference between the input rotational speed and the internal combustion engine rotational speed is less than or equal to the third threshold value.